Referring Major Domains

This display lists the major root domains (".com", ".net", ".gov", ".edu", etc.)
that your referrering sites are registered with when they direct a visitor to
your site.

Terms Used on Report:

Visitors

Also referred to as a 'Unique Visitor'. By default, this value represents
a visitor that comes to your site for the first time in a day. All subsequest visits during the day by
the visitor are not considered unique.

The definition of a visitor can be customized. You can set a custom period of inactivity that will cause the next access of the visitor
to be considered a new visit. The visit definition screen can be found on the 'Setup' menu.

This differs from a page view or hit in that a single visitor can have one visit per day but many page views
during a visit.